Yield potential and genotype-environment interactions of tetraploid-diploid (4x-2x) potato hybrids

Jong, H. De; Tai, G. C. C.; Russell, W. A.; Johnston, G. R.; Proudfoot, K. G.

doi:10.1007/bf02854419

Cited by 41 publications

(14 citation statements)

References 9 publications

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“…Firstly, following somatic or sexual polyploidization, unilateral or bilateral sexual polyploidization produces polyploids that are more vigorous than polyploids obtained by somatic doubling (McCoy & Rowe, 1986;Peloquin et al, 1989;Hahn et al, 1990). Secondly, in natural or sexual polyploids, unilateral sexual polyploidy, resulting from FDR, generally gives rise to 4x progeny with a higher level of heterosis than those resulting from SDR (De Jong & Tai, 1991), with the progeny from 4x-2x crosses being superior to those from 4x-4x crosses (De Jong et al, 1981;Werner & Peloquin, 1991 c). Thirdly, in the progeny of SDR and FDR crosses, the yield of tetraploids obtained from bilateral sexual polyploidization (FDRxSDR) can be higher than that of both 4x cultivars and unilateral sexual polyploids (Werner & Peloquin, 19916).…”

Section: Heterozygosity Following Fdr and Sdrmentioning

confidence: 99%

Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autopolyploid plants

1995

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summary The production of 2n gametes in plants, i.e. gametes with a somatic chromosome number, is considered to be the dominant process involved in the origin of polyploid plants. In this review, we provide a synthesis of current knowledge concerning the production of 2n gametes. Firstly, we describe the different methods used to detect and quantify the production of 2n gametes in plants, which include morphological and flow cytometry screening of the occurrence of 2n pollen, the analysis of crosses among diploid and tetraploid parents and the instigation of micro‐and mega‐sporogenesis. Secondly, the high level of inter‐ and infra‐specific variation in 2n gametes production is described. Thirdly, the various cytological anomalies responsible for the production of 2n gametes are reviewed, with particular reference to the relative genetic consequences of the first and second restitution divisions that give rise to 2n gametes. Fourthly, the significance of 2n gametes in crop plant improvement is discussed, in relation to somatic chromosome doubling to obtain new polyploid varieties. In particular, we compare the genetic and yield consequences of methods based on unilateral and bilateral sexual polyploidization. Finally, we outline how knowledge of the variety of mechanisms involved in 2n gamete production have increased our understanding of the evolutionary significance of polyploidy and the population biology of polyploid plants.

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Section: Heterozygosity Following Fdr and Sdrmentioning

confidence: 99%

Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autopolyploid plants

1995

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“…The positive relation between genetic diversity of parents and tuber yield of their progeny has been confirmed by many authors in potato, including Rowe (1967), Mendoza and Haynes (1974b), Mok and Peloquin (1975), Cubillos and Plaisted (1976), De Jong et al (1981), Veilleux and Lauer (1981), Landeo and Hanneman (1982), Schmiediche et al (1982), Estrada-Ramos (1984), Gopal and Minocha (1997a) and Luthra et al (2001Luthra et al ( , 2005. Negative heterotic effects (inbreeding depression) for yield and other characters are common for within Gp.…”

Section: Genetic Diversity Of Parentsmentioning

confidence: 58%

Challenges and Way-forward in Selection of Superior Parents, Crosses and Clones in Potato Breeding

Gopal

2015

Potato Res.

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The success of any potato breeding programme depends upon the selection of superior parents and cross combinations, and superior clones from the segregating progenies. However, due to the tetrasomic inheritance and heterozygous nature of cultivated potato, potato breeding has remained empirical, cumbersome and timeconsuming. Potato breeders have used a number of approaches to simplify and improve the efficiency of potato breeding. These include use of mid-parent/mid-self values, genetic diversity, combining ability, estimated breeding values and progeny tests for the selection of parents and cross combinations. The selection of superior clones from the segregating progeny has been hampered by low efficiency of selection in early generations particularly for tuber yield and its components. The possibility of in vitro selection and production of microtubers for early large scale trials has been explored. The procedures used and constraints observed are reviewed and discussed in this paper.

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“…2n gametes formed by parallel spindles, a process equivalent to first division restitution (FDR) (Mok & Peloquin, 1975a), result in maximum heterotic response because about 80% of the total heterozygosity of the parent and much of the epistatic interactions are transferred intact. Heterosis has been reported for total tuber yield, marketable yield and total solids/specific gravity in such crosses (Buso, 1986;Darmo & Peloquin, 1991;DeJong et al, 1981;Hutten et al, 1994;Masson & Peloquin, 1987;McHale & Lauer, 1981;Mok & Peloquin, 1975b). It has also been shown that there is no significant difference in yield, haulm maturity, vigour, uniformity, eye depth, number of tubers per hill and commercial over total yield index between families produced by parents with FDR without crossing over compared with those by parents with FDR with crossing over (Buso et al, 1999).…”

Section: Application To Potato Improvementmentioning

confidence: 91%

The reproductive biology of the potato and its implication for breeding

HannemanJr

1999

Potato Res

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Horticulture, University of Wisconsin-Madison, a mentor, friend and colleague, in recognition of the enormous contributions he has made to this area and for his enthusiasm for and stimulation of others to an awareness of the importance of its application to plant improvement.Additional keywords: 2n gametes, synaptic mutants, stylar barriers, Endosperm Balance Number, EBN, interspecific hybridization, introgression, imprinting, Solarium spp. SummaryHaploidy, 2n gametes, synaptic mutants, stylar barriers, endosperm barriers. Endosperm Balance Number (EBN) and its relationship to 2n gametes, stylar barriers and disomic genetics are a part of the reproductive biology of potato. Also all are tools for isolation and preservation of a species identity. Haploidy and 2n gametes allow for interploidy gene transfer. "Parallel spindles and synaptic mutants permit the transfer of entire parental genomes intact and are powerful tools in potato breeding. Stylar barriers provide a mechanism for interspecific isolation via unilateral incompatibility. Incongruity has also been invoked. Endosperm barriers have been discussed in terms of EBN which requires a 2 maternal:l paternal ratio in the endosperm for successful seed development. Genetic models suggesting three unlinked genes in a threshold-like system and a two gene system have been proposed. A relationship may exist between EBN and stylar barriers. The use and manipulation of 2n gametes, stylar barriers and EBN have been used effectively in germplasm transfer from species to cultivated potato.

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Yield potential and genotype-environment interactions of tetraploid-diploid (4x-2x) potato hybrids

Cited by 41 publications

References 9 publications

Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autopolyploid plants

Gametes with the somatic chromosome number: mechanisms of their formation and role in the evolution of autopolyploid plants

Challenges and Way-forward in Selection of Superior Parents, Crosses and Clones in Potato Breeding

The reproductive biology of the potato and its implication for breeding

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